Chalcogen, Lanthanoid, Rare earth, Hexagonal, Photoluminescence spectra

• Al-Eu-N-O-Si
• Al-Ba-Eu-Mg-O
• Ba-Cl-Eu-Gd-O-P
• Al-Ba-Eu-Mg-O-Si
• Ba-Cl-Eu-La-O-P
• rare earth
• chalcogen
• lanthanoid
• luminescent
• nonmetal